A.3 List of abbreviations

3GPP43.020Release 17Security related network functionsTS

In addition to the abbreviations listed in 3GPP TS 21.905, the following abbreviations are used in the schemes:

A3 authentication algorithm

A5 signalling data and user data encryption algorithm

A8 ciphering key generating algorithm

BSS Base Station System

HLR Home Location Register

IMSI International Mobile Subscriber Identity

Kc ciphering key (in the schemes below the notation Kc shall be read as Kc or Kc₁₂₈, depending on which ciphering algorithm is applied)

Kc[M] message encrypted with ciphering key Kc

Kc[TMSI] TMSI encrypted with ciphering key Kc

Ki individual subscriber authentication key

LAI Location Area Identity

MS Mobile Station

MSC Mobile services Switching Centre

R Random number (RAND)

S Signed response (SRES)

TMSI o/n Temporary Mobile Subscriber Identity old/new

VLR o/n Visitor Location Register old/new

Scheme 1 Location registration

– no TMSI available

Scheme 1 (concluded)

Scheme 2 Location updating

– MS registered in VLR

– TMSI is still available

Scheme 2 (concluded)

Scheme 3 Location updating

– MS not yet registered in VLR

– TMSI is still available

Scheme 3 (concluded)

Scheme 4 Location updating

– MS not yet registered in VLR; no old LAI

Scheme 5 Call set-up

– Mobile originated

– early assignment

Scheme 5 (concluded)

Scheme 6 Call set-up

– Mobile originated

– Off air call set-up

Scheme 6 (concluded)

Scheme 7 Call set-up

– Mobile terminated

– Early assignment

Scheme 7 (concluded)

Annex B (informative):
Security information to be stored in the entities of the GSM system